"Little Black Crap" are the corpses of the FUNGUS that's in your Tank(I'll bet).

Change out your Secondary fuel filter (Spin-On)(Or Bolt-On).
Fill it with Clean Diesel before you re-attach.
If the rear of the chassis is up in the air (ANY amount) it helps the "Bleed".
Crack the Lines at the Injectors and crank until you see fuel.
Rest the starter every 15 seconds of cranking for a 90 second period minimum.
Tighten the Injector CapNuts and Glow+ Start.

1.Get some Startron and put it in your Fuel tank.
It'll emzyme all the little boogers and allow passage through your filters,'Cause
they are minute enough after treatment to burn up in the engine.

2.When you ran the tank low...All the junk from all the Diesel pumps at all the
fuel stops since 1993 collected at the bottom of the uncleaned tank and
"Made a Run" at your Fuel Filters.

3.All that fungus is also inside the Aluminum tube the fuel sensor lives in...
preventing a proper/correct fuel level reading.
(You MAY have to pull the sensor out of the Tank and clean out the Innards.)

4. You aren't so much suffering from air in the lines ,as Fuel Starvation caused by Blockage!

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'84 300SD sold
124.128